多级离心泵首级叶轮内部流动的数值模拟

Numerical Simulation of Internal Flow of First-stage Impeller in Multistage Centrifugal Pump

为了解多级离心泵首级叶轮内部流动特性,基于N-S方程和标准κ-ε湍流模型对三长三短复合叶轮和四长四短复合叶轮内部流动进行了数值模拟,获得了两种叶轮在额定工况及非额定工况下的内部流场分布并进行了分析。结果显示,四长四短叶轮可改善叶轮内部流场、提高叶轮吸力面压力,进一步阻止小流量下的脱流现象,有效提高了整个泵的扬程和效率及高效区。

To obtain internal flow characteristics of first-stage impeller in multistage centrifugal pump,based on Navier-Storkes equations and turbulence model,two schemes of internal flow are simulated,which includes three-long three-short compound blades（the first scheme） and four-long four-short compound blades（the second scheme）.The distribution of inner flow field is analyzed under rated condition and non-rated condition.The results show that the second scheme can improve pump＇s internal flow field,increase the suction side pressure of impeller and prevent liquid inverse flow phenomenon;it raises pump＇s lift,efficiency and range of high efficiency zone.